Knife-fastening for pulp-engines.



PATENTBD MAY 5, 1903.

. M. A. MILLS.

KNIFE FASTENING FOR PULP ENGINES.

APPLICATION FILED JAN. 12,1903.

:0 MODEL.

' ttozwu o f w d Patented May 5, 1903.

ATENT OFFICE.

MELVIN A. MILLS, or LAWRENCE,(MASSACHUSETTS.

KNIFE-FASTENING FOFtPjULP-ENGINES.

SPECIFICATION forming partoffLettersj Patent No. 727,176, dated May 5, 1903. Application filed January 12, 1903. Serial No. 138,714. (No model.)

To all whom it may concern:

Beitknown that I, MELVIN A. MILLS, a cili- Zen of the United States, residing at Lawrence,in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Knife-Fastenings for Pulp-Engines, of which the following'is a tive elements of refining and beating engines.

The invention has special utility as a fas tening for the knife-blades of the revolving rolls of Jordan or refining and beating en gines.

A special object of the invention is to provide a form of knife-fastening permitting of the removal and replacing of the filling with facility, while at the same time effecting a secure locking thereof to the body with which it is associated. V 7

Also the invention contemplates a construction dispensing with all punching of the steel bars, as is commonto some forms of knife-fastenings, with the consequent weaking of the bars.

Also the invention obviates the employment of the hoops or bands which are now in extensive use for securing the filling in place.

Another distinct object of the invention is the provision of a construction wherein knife blades or bars of varying thickness may be employed, which is a matter of considerable importance, particularly in the refitting of a refining or beating engine with new filling.

With these and many other objects in View, which will more readily appear-as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts, which will be hereinafter more fully described, illustrated, and claimed.

The essential feature of the invention involved in the method of locking the knifeblades to the body and positively securing all parts against accidental displacement is necessarily susceptible to modification; but preferredembodiments of the invention are shown in theaccompanying drawings, in which Figural is a perspective view of the tapered roll or plug of a Jordan or refining engine constructed in accordance with this invention and equipped with the improved {knife-fastening, the view indicating one pair of knife-blades completely locked in place and another pair in position for being looked through the action of assembling the parts. Fig. 2 ,is an enlarged detail sectional view showing several groups or pairs of the knifeblades locked to the roll-body by the improved fastening means. Fig. 3 is a similar view showing the adaptation of the fastening to the body of a beater-roll, a small section of which is indicated. Fig. 4 is a detail sectional view suggesting a modification of the fastening.

Like reference-numerals designate correspondin g parts throughout the several figu res of the drawings.

In carrying out the invention it is the purpose to preserve the full strength of the knifeblade by doing away entirely with the punching of holes, slots, or other formations tending to weaken the same and to eifect a fasteningthereof to the body carrying the same by a direct interlocked connection between the knife-blades and said body and by a locking of the fastening key or element also to the body. This may be accomplished in various ways and is to be distinguished from that type of knife fastenings wherein the knife blades or bars may be interlocked with the body of the roll or plug, but which blades are provided with means for holding in place the Wedges or fastening key elements.

It is not the purpose of the present invention to restrict the knife-'fastening to any particular type of engine or to theroll of either a Jordan engine or a beating-engine, so it will therefore be understood that the fastening as an entirety is applicable as a knife-fastening generally for the knife-blades of pulp treating machines. illustrative purposes a few of the practical However, for

\ ing engines for paper-pulp.

embodiments of the fastening are shown in the drawings, and to which particular reference will now be made.

The invention is of special utility in connection with a Jordan or heater roll of solid formation, inasmuch as a roll of this type provides a firm and rigid support for the individual blades throughout their entire length. This cannot be attained by the employment of the hollow types of rolls which are commonly employed in refining and beat- Hence in the drawings the invention is illustrated as being preferably associated with solid-body rolls. In Fig. 1 the numeral 1 designates a Jordan roll or plug consisting of a solid casting or forging. This solid-plug casting'or forging may be either cast on or with the shaft 2; but in either event the advantage is derived of having a rotating plug which will always remain in perfect balance. Heretofore it has been customary to form the rolls of hollow castings. These castings are open to the objection of leaking, thus becoming partially filled with stock and water, which necessarily has the tendency to throw the roll out of balance. By the employment of a solid casting or forging for the roll-body these objections are obviated, besides presenting the best possible type of body for a fastening of the character contemplated by the present invention.

'- Referring more particularly to the fasted,

ingper se, the same involves forming the roll-body in its periphery with a series of Iongitudinal holding-grooves 3, producingin alternate relation thereto the integral solid supporting-ribs 4, likewise running longitudinally of the body and constituting lateral supports, with which are interlocked the individual knife-blades 5. Apair of the knifeblades 5 is designed to be fitted in each of the longitudinal holding-grooves 3 and to be held in place in interlocked engagement with the body through the medium of common fastening means. The supporting-ribs 4:, alternating with each groove 3, are provided upon their sides constituting the opposite walls of such groove with the undercut locking-bevels '6, into which are designed to be deflected or interlocked the laterally-deflected inner holding members 7, constituting the inner integral edge portions of the blades themselves.

In the preferred construction the individual holding-grooves 3 are channeled out below the plane of the shoulders produced by the undercut locking-bevels 6 to provide at the base thereof a dovetailed locking-seat 8, extending longitudinally of the main groove and designed to constitute a direct locking means for securing in place the fastening key or element 9, associated with the pair of knife-blades within the groove and interposed between such knife-blades.

The fastening key or element 9 usually consists of a wooden bar or wedge adapted 'to,be forcibly driven downward between the pair of knife-blades which have been previously placed within a groove 3and against the side walls provided by the adjacent supporting-ribs 4. Prior to forcing the key or wedge 9 downward between the blades and into the groove there is placed within the base of the latter a wedge-strip 10, the sharpened edge of which is designed to longitudinally penetrate the inner side of the key or wedge as the same is driven into it.

In some forms of the invention the individual knife-blades consist of plain steel bars fiat throughout and having no proturberances or projections. These blades or bars are placed, respectively, at opposite sides of the groove with which they are associated, and then the fastening key or wedge 9 is interposed between them in the position as indicated by position I in Fig. 1 of the drawings.

WVith the fastening key or wedge in the position indicated by the reference I in Fig. 1 it will be obvious that as the same is forcibly driven inward it will necessarily deflect the inner edges of the blades laterally into registering interlocked engagement with the side-locking bevels 6, and as the driving pressure is continued the inner side of the fastening key or wedge passes into the dovetailed subseat Sand is spread into interlocked connection with said seat by theLewis pin or wedge-strip 10. In a completed condition the fastening appears as shownby the position II in Fig. 1 and also by the section shown in Figs. 2 and 3 of the drawings.

In replacing fillings the fastening keys'or wedges 9 are displaced endwise or longitudinally by driving them out of the holdinggrooves.

In the construction described it is apparent that the body of the plug itself holds the knife-blades in position and also the body of the plug locks in place the fastening keys or wedges 9, 'thus insuring an exceptionally rigid and powerful fastening, which will insure the retention of the knifeblades in working position until entirely worn out and the replacing thereof becomes necessary.

A modification of the invention is suggested in Fig. 4 of the drawings, in which the locking-subseat 8 is dispensed with and in place thereof alocking-screw 11 isassoci'ated with the fastening-key 9, which is interposed between the pair of knife-blades. This-locking-screw passes through the fastening' key and engages directly with the solid body of the roll or plug, thus preserving the combination suggestednamely, that of the knife blades and the fastening-key therefor being locked directly to the plug-body.

In the suggested modification wooden filling-strips 12 may be arranged between the blades on top of the fastening-keys and the supporting-ribs 4 alternating therewith. Also in this construction it is preferable to provide the knife-blades 5 at their inner edges with well-defined beveled engaging fins 7 projecting at both sides thereof and engaging the correspondingly-beveled portions of the rib-walls 4 and of the keys 9 In Fig. 3 of the drawings the numeral 1 designates a section of the solid body of a beating-engine roll, showing the improved knife-fastening applied thereto. In this type of roll it is also preferable to employ one of solid formation,with the circulating-channels 1 alternating with the projecting rib portions 1, in which are formed the holdinggrooves for receiving the knife-blades and the fastening keys or wedges therefor.

Other modifications will suggest themselves to those skilled in the art, and it will be understood that various changes in the form, proportion, and minor details of construction may be resorted to without departing from the spirit of the invention or sacrificing any of the advantages thereof.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is

1. In a knife-fastening of the character described, a body provided with longitudinal holding-grooves,- a pair of knife-blades arranged in each groove and having a direct interlocked engagement with the body, and a fastening-key interposed between each pair of blades and driven into the grooves, said fasteningkey having a locked connection with the body independent of the blades.

2. In a pulp-treating engine, a revolving roll consisting of a body formed of a solid casting or forging and provided in the periphery thereof with a series of longitudinal holdinggrooves, a pair of knife-blades arranged in each groove and having a rigid bearing against and directly interlocked with the said solid body, and a fastening-key interposed between each pair of blades and driven into the groove therefor, said fastening-key having a locked connection with said solid body independent of the blades.

3. In a fastening of the class described, the combination with the body, of the knifeblades arranged in pairs, those of each pair having an interlocked connection withthe body, and a fastening-key for each pair of knives interposed between and arranged to hold the same in engagement with the body, said fastening-key having a locked or fastened connection with the body at one side of the plane of the inner edges of the blades and independent of the latter.

4. In a fastening of the class described, the body having longitudinal holdinggrooves, the side walls of which are provided with undercut locking-bevels, a pair of knife-blades arranged in each groove and having interlocked connection with the said locking-bevels, and a fastening-wedge driven between each pair'of blades to hold the same in their locked positions and having an independent locked or fastened connection with the body.

5. In a fastening of the class described, the body having longitudinally arranged holding-grooves whose side I walls are provided with undercut locking-bevels,the said grooves being further provided below the plane of said bevels with locking-subseats, and a fastening-wedge driven between each pair'of blades and having a locked engagement with the said subseat.

6. In a fastening of the class described, the body having longitudinally-arranged grooves whose side walls are provided with undercut locking-bevels, each groove being further provided below the plane of said bevels with dovetailed locking-subseats, a wedge adapted to be arranged to rest against the base of the subseat of each groove, and a fastening key or Wedge driven between each pair of blades onto and over the wedge whereby the same becomes spread into the dovetailed subseat and against the parts of the blade engaging said locking-bevels.

In testimony whereof I affix my signature in presence of two witnesses.

' MELVIN A. MILLS. Witnesses:

WVALTER' COULSON, JOHN J. SWEENY. 

